View topic - Space Hawks (double) update

I finally decided to share my current version of Space Hawks for
- SMS : lot of bugs fixed
- GG : based on (almost) same code but you'll be able to notice a lot of difference between the two. Artefacts are still there, I don't know if I'll fix them or not...

Next step is hardware testing on the 2 systems.
If anyone could provide me feedback on GG or jap/us SMS, I'll try to fix any issue ;)

For the artifacts... since you can't move them offscreen on the left, you can try adding some useless operation before changing the color so that the artifacts would be offscreen on the right... I think it may fix that.

Or you can scroll the GG 'viewport' more on the right so that the artifacts fall offscreen anyway...